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Stiind ca A plus B = 14 si B plus C =9 calculati 3A plus 5B plus 2C

Răspuns :

A+B=14
B+C=9

3A+5B+2C=
3A+3B+2B+2C=
3(A+B)+2(B+C)=
3X14+2X9=42+18=60